| Dorchester to Oswego (Illinois) | 3,919.91 mi (6,308.49 km) |
| Dorchester to Oswego (New York) | 3,372.62 mi (5,427.70 km) |
| Dorchester to Otsego (Minnesota) | 3,957.17 mi (6,368.45 km) |
| Dorchester to Ottawa (Illinois) | 3,953.86 mi (6,363.13 km) |
| Dorchester to Ottawa (Kansas) | 4,332.90 mi (6,973.14 km) |
| Dorchester to Ottumwa (Iowa) | 4,108.26 mi (6,611.60 km) |
| Dorchester to Overland (Missouri) | 4,137.64 mi (6,658.89 km) |
| Dorchester to Overland Park (Kansas) | 4,296.82 mi (6,915.07 km) |
| Dorchester to Overlea (Maryland) | 3,544.79 mi (5,704.80 km) |
| Dorchester to Oviedo (Florida) | 4,238.28 mi (6,820.86 km) |
| Dorchester to Owasso (Oklahoma) | 4,468.08 mi (7,190.68 km) |
| Dorchester to Owatonna (Minnesota) | 3,996.51 mi (6,431.76 km) |
| Dorchester to Owensboro (Kentucky) | 4,051.92 mi (6,520.93 km) |
| Dorchester to Owings Mills (Maryland) | 3,554.15 mi (5,719.86 km) |
| Dorchester to Owosso (Michigan) | 3,698.73 mi (5,952.54 km) |
